Can’t get gallery to work

I’m trying to make a gallery of a playlist from my youtube channel in a vertical format and I can’t get the gallery to work. I keep getting this Youtube API error message:

Sorry, there was a YouTube API error:?Access Not Configured. YouTube Data API has not been used in project 111792138183 before or it is disabled. Enable it by visiting?https://console.developers.google.com/apis/api/youtube.googleapis.com/overview?project=111792138183?then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.?Please make sure you performed the?steps in this video?to create and save a proper server API key.